Figure 1. (a) Top and (b) side views of the pulsed laser ablation setup integrated with the synchrotron-based UV Resonance Raman system of the IUVS beamline to perform in situ monitoring of the growth of polyynes; (c) In the colormap, in situ UVRR spectra collected at 226 nm as excitation wavelength in acetonitrile (MeCN) during 15 min of ablation. The integrated UVRR Raman signals of HC8H's Raman mode (red) and the relevant solvent Raman band (black) are displayed in the left-hand box. The first (0 min) and last (15 min) spectra are reported in the bottom box of the panel; (d) Evolution of the concentration of size-selected H-capped polyynes during PLAL in different solvents as a function of the ablation time. Concentrations of HC8H, HC10H, HC12H, and HC14H have been extracted from in situ UVRR data collected at 226, 251, 272, and 264 nm, respectively. P. Marabotti1,2, S. Peggiani1, S. Melesi1, B. Rossi3, A. Gessini3, A. Li Bassi1 V. Russo1, C.S. Casari1 1 Department of Energy, Politecnico di Milano, Milano, Italy 2 Institut für Physik, Humboldt-Universität zu Berlin, Berlin, Germany 3 Elettra - Sincrotrone Trieste S.C.p.A., Trieste, Italy e-mail: pietro.marabotti@polimi.it; carlo.casari@polimi.it Acknowledgments P.M., S.P., S.M., A.L.B., V.R., and C.S.C. acknowledge funding from the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation program ERC Consolidator Grant (ERC CoG2016 EspLORE grant agreement no. 724610, website: www.esplore.polimi.it). We acknowledge Elettra Sincrotrone Trieste and CERIC-ERIC Consortium for providing access to their synchrotron radiation facilities and for financial support. Original paper P. Marabotti et al., Small 20, 49 (2403054); DOI: 10.1002/smll.202403054. Fig. 1 Structure and Dynamics Elettra Highlights 2024–2025 79
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